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United States Patent | 5,708,973 |
Ritter | January 13, 1998 |
A radio system having frequency optimization, particularly a mobile radio telephone system having base stations and subscribers (low speed mobile stations or stationary stations) is provided. In order to avoid fluctuations and interruptions of the reception level, the invention provides that the reception level and/or transmission quality of all frequencies or channels or of a part of the frequencies or channels of the channels available in a base station are constantly measured in every subscriber station (mobile station or stationary station). The measured values are communicated to the base stations wherein the frequencies or channels are allocated to the subscribers based on the overall information so that an optimally optimum frequency or transmission quality is allocated to each connection.
Inventors: | Ritter; Gerhard (Thaining, DE) |
Assignee: | Siemens Aktiengesellschaft (Munich, DE) |
Appl. No.: | 281038 |
Filed: | July 27, 1994 |
Jul 27, 1993[DE] | 43 25 190.0 |
Current U.S. Class: | 455/62; 455/161.3 |
Intern'l Class: | H04B 007/00; H04B 007/26; H04B 017/00; H04Q 007/00 |
Field of Search: | 455/62,33.1,34.2,161.3,63,34.1,33.2,53.1,54.1,56.1 375/224,308 379/58,59,60 370/95.1,95.3,236,347 |
5203012 | Apr., 1993 | Patsiokas et al. | 455/62. |
5239682 | Aug., 1993 | Strawcynski et al. | 455/62. |
5345597 | Sep., 1994 | Strawcynski et al. | 455/62. |
5355522 | Oct., 1994 | Demange | 455/62. |
Foreign Patent Documents | |||
0490509 | Jun., 1992 | EP. |
J. Bingham, "Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come", IEEE Communications Magazine, 28(1990) May, No. 5, New York, US, pp. 5-8 and 11-14. W. Webb, "Modulation Methods for PCNs", IEEE Communications Magazine 30(1992)Dec., No. 12, New York, US, pp. 90-95. |